Heat exchanger for varying the lubricating oil temperature in internal-combustion engines



Jan. 10, 1956 E J. KREMSER 2,730,083

HEAT EXCHANGER FOR VARYING THE LUBRICATING OIL TEMPERATURE ININTERNAL-COMBUSTION ENGINES Filed July 31, 1953 2 Sheets-Sheet l FIG.|

INVENTOR. Johann Kremser BY I ATTORNEY 10, 1956 J. KREMSER 2,730,083

HEAT EXCHANGER FOR VARYING THE LUBRICATING OIL TEMPERATURE ININTERNAL-COMBUSTION ENGINES Filed July 31, 1953 2 Sheets-Sheet 2 FIG.3

FIG.2

ATTORNEY the heat exchanger is arranged.

United States PatntO HEAT EXCHANGER FOR VARYING THE LUBRI- CATING OILTEMPERATURE IN INTERNAL- COIVIBUSTION ENGINES Johann Kremser, Hannover,Germany Application July 31, 1953, Serial No. 371,497

4 Claims. (Cl. 12341.33)

The present invention relates to a device for varying the lubricatingoil temperature in internal combustion engines, and particularly dealswith a heat exchanger fitted in the lubricating oil and, respectively,cooling water circuit of internal combustion engines. It is alreadyknown to use oil coolers or heat exchangers of difl erent design whichwere mounted on the engine block in a suitable way, in order to reducethe lubricating oil temperature.

It is one object of the present invention to provide a design which is aparticularly suitable and simplified design of said device which mayeasily be fitted to an engine block.

It is another object of the present invention to provide a heatexchanger which is combined in one unit together with the cooling mediumpump, both parts being connected with each other in a way so that thesuction flow of the cooling medium passes through the heat exchanger.

It is still another object of the present invention to provide a heatexchanger which also serves as a carrier for the cooling medium pump,the complete unit with its longitudinal axis being arranged parallel tothe engine axis on the engine block.

It is yet another object of the present invention to provide the engineblock with a recess or the like which receives the unit formed by thepump and the heat ex.- changer, said unit being secured in place by afastening strap. At the same time a connection may be provided in therecess of the engine block, said connection being in communication withthe oil pressure line within the engine block and, on the other hand,being connected to the oil inlet of the heat exchanger. The heatexchanger may be of a length so that its oil outlet is outside of thecontours of the engine block.

With these and other objects in view which will be come apparent in thefollowing detailed description, the present invention will be clearlyunderstood in connection with the accompanying drawings in which:

Figure 1 is an axial section through a pump for the cooling medium andthrough the heat exchanger;

Fig. 2 is a front elevation of a V-engine with the pump and the heatexchanger; and

Fig. 3 is a cross-section through the heat exchanger.

Generally, the cooling medium pump comprises a housing 1, enclosing theimpeller 3 journalled on the drive shaft 2. The cooling medium is passedthrough the cooling medium discharge pipe 4 and sucked-in in the middleof the housing. On the suction side of the pump It comprises a pipe 7which is provided with ribs or helicoid elevations 8 on itscircumference. Passages 9 for the lubricating oil are thus formedbetween said ribs. The pipe 7 with the ribs 8 is enclosed by a jacket10. At one end the part described above is inserted into the housingpart 6, which also carries the pump housing 1. Inside of part 7 there isa suction pipe 5 which transfers the cooling medium from the inlet 14along the inner walls of the pipe 7 to the pump inlet. The coolingmedium flows through the heat exchanger in the direction indicated bythe arrows. At its free end the heat exchanger is provided with a cap 11which in turn is provided with the inlet for the lubricating oil 12. Thelubricating oil flows from the engine through the inlet 12 and throughthe entire length of the heat exchanger, and is discharged through theoutlet 13 in the housing part 6.

The drawing clearly illustrates that the heat exchanger and the coolingmedium pump form a self-contained unit of substantially cylindricalshape-which may easily be fitted to the engine block 15, parallel to thelongitudinal axis of the engine. For this purpose the engine block 15has a recess 16 into which ends the lubricating line 17 so that it isconnected with the oil inlet 12 when fitting the heat exchanger 7. Astrap 18, a clamp, or the like secures the unit in its position. Thelength of said exchanger and, respectively, the fixing of said exchangerare laid out so that the lubricating outlet 13 is in front of theforward end of the engine block 15 where it may be connected to thelubricating oil filter 19.

Fig. 2 shows the application of the unit on a V-engine, the cylinders 20of said engine being arranged in form of a V on the engine block 15.

While I have disclosed one embodiment of the present invention, thisembodiment is given by example only and not in a limiting sense, thescope of the present invention being determined by the objects and theclaims.

I claim:

1. In a heat exchanger unit for a cooling medium in internal combustionengines having an engine block, a housing, a pump mounted in saidhousing, a suction pipe disposed adjacent to and connected with saidpump at the suction side of the latter, a jacket enclosing said suctionpipe, an oil pipe disposed inside of the jacket, said oil pipe having aspiral rib disposed at the outer surface thereof, and said spiral ribengaging the inner face of the jacket, said spiral rib combined with thejacket defining a helical channel adapted to feed oil therethrough to becooled, the inner face of said oil pipe being spaced apart from saidsuction pipe and the space between said suction pipe and said oil pipedefining a first passage for said cooling medium in a direction awayfrom said pump and communicating with the free end of said suction piperemote from said pump, and said suction pipe forminga second passage forsaid cooling medium in a direction towards said pump, inlet means forsaid cooling medium disposed adjacent said pump into said first passage,inlet means for said oil into said helical channel disposed at the endremote from said pump and outlet means for said oil from said helicalchannel adjacent said pump, in order to provide a counterstream betweensaid cooling medium and said oil to be cooled.

2. The heat exchanger unit, as set forth in claim 1 which includes anadditional housing disposed between said first mentioned housing andsaid jacket, said additional housing forming a carrier for said jacketand said first mentioned housing, and said inlet means for said oilbeing provided in said additional housing for feeding said oil into saidfirst passage.

3. The heat exchanger unit, as set forth in claim 1, which includes anadditional housing disposed between said first mentioned housing of saidpump and said jacket, said additional housing forming a carrier for saidjacket and said first mentioned housing, said inlet means for said oilbeing provided in said additional housing for feeding said oil into saidfirst passage, and a drive shaft in said first mentioned housing, andthe axis of said drive shaft being disposed coaxially with thelongitudinal axis of said suction pipe.

4. The heat exchanger unit, as set forth in claim 1, which includes anadditional housing disposed between said first mentioned housing of saidpump and said jacket, said additional housing forming a carrier for saidjacket and said first mentioned "heusing, said inlet means for saidvtoil being provided in said additional housing for feeding said oilinto said first passage, a drive shaft in said first mentioned housing,the axis of the drive shaft being disposed 'coasiaii y with shelongitudinal axis of said suction :pipe, said pump with said suctionpipe, said oil pipe and said jacket forming a substantially cylindricalbody and said engine block having a recess complementary in itsconfiguration to said cylindrical body, and the latter being removablyreceived in said recess,

"UNTTED STATES PATENTS Paugh Oct. 24,

Brehob Jan. 23,

Scheiterlein Dec. 30,

FOREIGN PATENTS e many y 2

